The root of polynomial $ p(x) $ is:
$$ \begin{aligned}x &= \dfrac{ 3371 }{ 245 } \end{aligned} $$Step 1:
Combine like terms:
$$ \color{blue}{285x} \color{blue}{-40x} -3371 = \color{blue}{245x} -3371 $$Step 2:
$$ \begin{aligned} 245x-3371 & = 0 \\[1 em] 245 \cdot x & = 3371 \\[1 em] x & = \frac{ 3371 }{ 245 } \end{aligned} $$